| 摘要 |
<p>PROBLEM TO BE SOLVED: To secure a fuel discharge amount from a fuel pump for a longer time using generated electric power, without being influenced by a change in the operating condition of a vehicle to involve a change in the fuel discharge amount from the fuel pump, while driving an on-vehicle device to improve fuel efficiency.SOLUTION: A vehicular power supply device 10 includes a power supply change-over part 13 for changing over a power supply which drives an on-vehicle device 20 including a fuel pump 21 into either a main power supply 11 or a sub power supply 12 of which the lower limit voltage is lower than that of the main power supply 11, an operating condition determining part 15 for determining either a first operating condition in which a fuel discharge amount from the fuel pump 21 is a preset fuel discharge amount or a second operating condition in which the fuel discharge amount from the fuel pump 21 is greater than in the first operating condition, and a power supply change-over control part 16 for controlling the power supply change-over part 13 to change over the power supply from the sub power supply 12 into the main power supply 11 when a voltage detected by a power supply voltage detecting part 14 is lower than a preset voltage value and the operating condition determining part 15 determines the second operating condition.</p> |
